华北与西伯利亚板块的对接过程: 来自西拉木伦缝合带变形花岗岩锆石LA-ICP-MS U-Pb年龄证据

李益龙; 周汉文; 钟增球; 张雄华; 廖群安; 葛梦春

华北与西伯利亚板块的对接过程: 来自西拉木伦缝合带变形花岗岩锆石LA-ICP-MS U-Pb年龄证据

李益龙^{1, 2},
周汉文^{1, 2, ,},
钟增球^{1, 2},
张雄华¹,
廖群安¹,
葛梦春¹

1.
中国地质大学地球科学学院, 湖北武汉 430074
2.
中国地质大学地质过程与矿产资源国家重点实验室, 湖北武汉 430074

基金项目:

国家重点基础研究发展计划项目 2007CB411307

中国地质调查局项目 1212010510507

详细信息

作者简介:
李益龙(1983-), 男, 博士生, 主要从事变质岩石学研究

通讯作者:
周汉文, E-mail: hwzhou@cug.edu.cn

中图分类号: P597
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- 被引次数: 0
出版历程
- 收稿日期: 2008-09-12
- 刊出日期: 2009-11-25

Collision Processes of North China and Siberian Plates: Evidence from LA-ICP-MS Zircon U-Pb Age on Deformed Granite in Xar Moron Suture Zone

1.
Faculty of Earth Sciences, ChinaUniversity of Geosciences, Wuhan 430074, China
2.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China

摘要

摘要: 房框子沟花岗质片麻岩NEE向展布于内蒙古林西县双井镇的房框子沟村一带, 是一套侵入到双井片岩中的变质变形侵入体, 其边缘和中央分别为云染状和均质的花岗质片麻岩.利用LA-ICP-MS锆石U-Pb原位定年方法对采自该侵入体边缘和中央的样品进行了定年, 结果表明, 岩浆在271.9±1.6Ma开始侵位于双井片岩中, 在接触带上多发生混合岩化, 造成岩体边缘呈云染状, 在264.8±1.8Ma岩体主体侵位, 之后由于西伯利亚板块与华北板块的持续碰撞缝合, 岩体在应力作用下变形变质形成了今天看到的房框子沟花岗质片麻岩的面貌, 到231±2Ma碰撞基本结束, 西伯利亚板块与华北板块最终拼合.
- 花岗质片麻岩 /
- 锆石 /
- LA-ICP-MSU-Pb定年 /
- 地质年代 /
- 双井 /
- 内蒙古
Abstract: The Fangkuangzigou granitic gneisses, extending with NEE trend along Fangkuangzi village in Linxi county, Inner-Mongolia province, are deformed and metamorphosed granites which intruded into the Shuangjing schists. The gneisses are nebulitic and homogeneous separately in its edge and center. The LA-ICP-MS zircon U-Pb dating method was applied to determine the ages of gneisses both from the edge and center. It is indicated that the magma emplacement initiated at about 271.9±1.6Ma ago and intruded into Shuangjing schists, then migmatization and nebulitic structure were induced into the contact zones. The pluton was formed dominantly at 264.8±1.8 Ma ago. The pluton was deformed and metamorphosed into granitic gneiss by the collision betweenthe Siberian and North China plates. The collision was ended until 231±2 Ma ago, then the Siberian and North China plates were finally converged.
- granitic gneiss /
- zircon /
- LA-ICP-MS dating /
- geochronology /
- Shuangjing /
- Inner-Mongolia

HTML全文

图 1 内蒙古林西县双井地区地质简图

1.双井片岩; 2.花岗质片麻岩; 3.志留系西别河组; 4.杏树洼蛇绿岩; 5.二叠系哲斯组; 6.中生代侵入岩; 7.中生代火山岩; 8.第三系玄武岩; 9.第四系; 10.断层; 11.村庄; 12.采样点及编号

Fig. 1. Geological map of Shuangjing area in Linxi county, Inner-mongolia province

下载: 全尺寸图片幻灯片

图 2 房框子沟花岗质片麻岩边缘(a) 和中央(b) 代表性锆石CL图像和U-Pb年龄

其中白线为比例尺, 长度为50μm, 圆圈表示剥蚀激光束对应的位置, 直径为32μm

Fig. 2. Representative CL images of single zircon grains from edge (a) and center (b) and thier U-Pb ages of the Fangkuangzigou granitic gneiss

下载: 全尺寸图片幻灯片

图 3 房框子沟花岗质片麻岩边缘(a, b) 和中央(c, d) 的LA-ICP-MS锆石U-Pb谐和图和加权平均年龄

Fig. 3. LA-ICP-MS zircon U-Pb concordia diagram and weighted average age from edge (a, b) and center (c, d) of the Fangkuangzigou granitic gneiss

下载: 全尺寸图片幻灯片

表 1 云染状花岗质片麻岩(8875)的LA-ICP-MS锆石U-Pb分析结果

Table 1. LA-ICP-MS zircon U-Pb analytic data for nebulitic granitic gneiss (8875)

表 2 均质的花岗质片麻岩(8877)的LA-ICP-MS锆石U-Pb分析结果

Table 2. LA-ICP-MS zircon U-Pb analytic data for homogeneous granitic gneiss (8877)

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